Lamp hanger structure



Aug. 18, 1931. Y A. J. THoMPsQN 1,819,529

` LAMP HANGER STRUGTURE Filed Oct. 27 1930 F i l mvemon 75ml/2.50m

ATTORNEYS Patented Aug. 18, 1931 C ALLISON THOMPSON, F CLEVELAND, OHIO `LAMP HANGER STRUCTURE Appiication med oetober 27, 1930. serial No. 491,445.

i This invention relates to lamp fixtures of the type comprising `a main hanger member adapted to be secured as against a ceiling, and 'a lamp hanger member suspended from the main hanger member to be lowered therefrom as for cleaning or replacement of the lamp carried thereby.

These two principal members of such a lamp fixture are provided with cooperative latch means whereby when the lamp hanger member is in raised position it may be there maintained. To this end the main hanger member may have a vertically disposed slotted guide tube, and the lamp hanger member a stem adapted to enter said guide, with means on said stem' to enter the slot of the guide and carrying a latch dog engageable with a shoulder on the outside of the guide. The guide and stem parts being centrally y located, it will be apparent that the point of support in late-hed position will be eccentric of the main hanger members, so that unless a perfect fitting between guide and stem is n had the lamp hanger member will not be exactly plumb when latched. Contactorsare carried by the main hanger members to be interengaged when the former parts are latched, and the contacts are 'impaired if the lamp hanger member is not plumb. Since it is not practicable to machine the guide and stem parts for a close lit therebetween, it becomes necessary to provide other means for properly positioning the stem in the guide,

y and such is the obj ect of this invention.

35. Further objects and advantages of the invention will he apparent from the following description, taken in connection with the accompanying drawings, wherein Figs. 1 and 2 are respectively front and side assembly 0 views of theparts, largely in elevation, but

partly Iin section to show details of construe-- tion; Fig. 3 is a perspective view of the guide tube associated with the main hanger meme ber, partly broken away; and Fig. 4 is a sectional elevation of the latter on a central plane.

With reference to the drawings, the principal parts of the main hanger member are a combination sheave and bracket 1v adapted to be secured upon a ceiling, a pair of contactors 2 carried thereby and the guide tube 3 vertically positioned between the contactors 2. y

VThe hanger member immediately supports a luminair 4, carries a pair of contactors 5 and has therebetween the stem 6. A chain 7 is bent over the sheave 8 of the main hanger member, passes downwardly therethrough and through the stem 6 which is hollow, and

is secured therewith as at 9. Obviously byA this chain'thelamp hanger member may be raised to the position'shown wherein the contact is'made between the contactors 2 and 5, and'may be lowered from this position when attention tol the luminair is desired. The contactors 5 .are yieldably supported on the lamp hangermember by an arrangement including the'spring 10, and leads 11 carry from these contactorselectric current supplied to the luminair.

. The 'guide 3 is slotted on one side as at 12 to receive an arm 18, laterally extending from thenstem 6, and the lower structure of the guide is diagonally disposed .as at 14`to provide a cam cooperative with the arm 13 by which' the contactors 2 and 5 are broughtinto e registry as the stem 6 entersthe guide.

Latch means are lprovided for maintaining the lamp hanger member in raised position and to this end a dog 1 5is pivot-ally mounted on the arm 13 as bythe Cotter pin 16, which:

dog has a protectinglip 17 movable inwardlyV of the stem by the yweight of the other parts ofthe dog. The guide 3 on either side of itsv slot12 is provided with a shoulder 18 cooperative with the lip 170i the dog. i By this arrang`ement,when the chain 7 is manipulated to raise the lamp hanger member to uppermost position and then slowly released, the parts'will latch and thereafter by a pull upon the' chain followed by a quick release thereof, unlatching `of the lamp hanger member maybe effected. e Y What has thus far been described is not new in the'art but will be found set forth more in detail in my Patent No. 1,552,654, of 4September v8,' 1925. `Where the guide and stem members Sand 6.are tobe of Vcastmaterial it will be obvious that the general inner diameter of the guide must be considerably greater than the diameter of the stem to allow for variations in castings. Butsince the support of the stem in latched position is had'on one side of the center line of the parts, there will be a tendthe lamp hanger member is supported Von the ance in the guide.

ency to swing out of plumb, as to the left, Fig. 2,I about the cotter pin16.

To plumb the stem and consequently the lamp hanger'member when latched, I pro- ',vide upon the inner surface of the guideop# posite the slot 12 and well above the shoulder 18, a boss 19. As appears from Figs. 3 and 4 this boss is arranged to present a curved or arcuate face eccentric ofthe` general interior surface of the guide. Before' latcli'ing, when In order t0 eXact-lyposition thestem in the guideV at the instant' of vtheloclring operation, I provide withinftheA guide adjacent ther shoulders 18,bosses 2O which together follow a curvature on the side of the slot12 eccentric. of the general interior of theguid.

On the lowerV extremity vof the' guide I maylp'rovde a third'boss 21, against which the stem may rst bear as it entersthe guide. for purposeof improving alignmentfof dog to support said lamp hanger member in y raised position, and means for maintaining said stem vertical in said guide when said dog is engaged, and comprising a boss within said guide at an elevation above said shoulder and on the side thereopposite only.

2. In a lamp hanger, a main hanger member having a vertically disposed cylindrical guide tube' having a slot on one side, a lamp hanger member having a cylindrical stem adapted to lloosely fit within said guide,

means associated with said main hanger member for raising and lowering said lamp hanger member-to cause said stem to enter or leave said guide, an arm 0n said stem adapted to enter the slot of said guide, a latch dog carried by said arm, a shoulder on the outside of said guide engageable by said'latchdog to support said 'lamp hanger' vmember in raised position, and aboss within said guide for bearing against said stem,'said boss being on one side only of said guide and presenting a curved face eccentric of the general guide aXls. v-

' In testimony'whereof I hereby affix my signature. y v

ALLISON J. THOMPSON.

thecontactors 5. This boss 21 however does j not "concern fthe described functioning of the bosses@ and 20 kIhave found the ydescribed arrangement of bosses tobe milch 'superior to l an'attempted exactly cylindricalbpening inthe guide, as

accuracy in castinggoffthese bosses Vmay be maintained within' much' closer limits than average throughout the casting." Since each ofthe bosses is located upon/oneY side only of the guide such' accuracyin foundry work is made possible that no subsequent machining ofthe parts-is. required. What I claim is 1. In a lamp hanger, a main hanger member having a vertically disposed slotted guide tube, a lamp hanger member having a vstem adapted to loosely fit within said guide, means associated with said main hanger member for raising and loweringV said lamp hanger member to cause said stem to enter or leave said guide, an arm on said stemadapted to enter the slot of said guide, a latch dog carried by said arm, a shoulder on the outside of said guide engageablevby said latch 

